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rostellum
[ ro-stel-uhm ]
noun
- Biology. any small, beaklike process.
- Botany. a beaklike modification of the stigma in many orchids.
- Zoology.
- a projecting part of the scolex in certain tapeworms.
- a part of the mouth in many insects, designed for sucking.
rostellum
/ °ùɒˈ²õ³ÙÉ›±ôÉ™³¾ /
noun
- biology a small beaklike process, such as the hooked projection from the top of the head in tapeworms or the outgrowth from the stigma of an orchid
Derived Forms
- °ù´Ç²õˈ³Ù±ð±ô±ô²¹³Ù±ð, adjective
˜yÐÄvlog History and Origins
Origin of rostellum1
˜yÐÄvlog History and Origins
Origin of rostellum1
Example Sentences
Rostellum: a small beak; applied to the mouth parts of sucking lice: also used in Hemiptera, as = rostrum; q.v.
Anthera fere immersa, Rostellum integrum ut in omnibus glandula orbotis Pollinia 8.Â
With Spiranthes autumnalis, the pollen-masses cannot be applied to the stigma until the labellum and rostellum have moved apart, and this movement is very slow.
By the way, Cephalanthera has single pollen-grains, but this seems to be a case of degradation, for the rostellum is utterly aborted.
I have been much interested by what you say on the rostellum exciting pollen to protrude tubes; but are you sure that the rostellum does excite them?
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